Remote code execution in widely used Google Chrome PDF handling; affects enterprise endpoints and web attack surface, likely to be prioritized by IT teams.
CVE-2026-106421
Use-after-free in Chrome PDF allows remote code execution in browser sandbox.
Is CVE-2026-106421 being exploited?
Not confirmed. CVE-2026-106421 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-106421?
CVE-2026-106421 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-106421?
Yes. A fix has been recorded for CVE-2026-106421. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-106421 affect?
CVE-2026-106421 affects Google Chrome < 155.0.8059.39, Chrome Desktop (Windows/macOS/Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-106421?
Update Chrome to 155.0.8059.39+ immediately; restrict untrusted PDFs until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution in Chrome's PDF handler via crafted HTML/PDF; attacker can execute arbitrary code in browser and may pivot if sandbox escape occurs.
Immediate action required
- affected< 155.0.8059.39
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.